An image of a book shown on a website is 1.5 inches wide and 3 inches tall on a computer monitor. The actual book is 9 inches wi
2 answers:
Answer:
18 inches tall.
Step-by-step explanation:
The width of an image of a book shown on a website = 1.5 inches
and length of the book shown on the website = 3 inches
The actual width of the book = 9 inches
Scale of the book image =
1 inches = 6 inches
The actual length of the book = 3 × 6
= 18 inches.
The actual book is 9 inches wide and 18 inches tall.
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Given:
There are given that the cos function:
Explanation:
To find the value, first, we need to use the half-angle formula:
So,
From the half-angle formula:
Then,
Since 105 degrees is the 2nd quadrant so cosine is negative
Then,
By the formula:
Then,
Put the value of cos210 degrees into the above function:
So,
Final answer:
Hence, the value of the cos(105) is shown below: